During his treatment over the last six months he has had numerous blood transfusions through countless operations and endured chemotherapy.

The school's principal Elizabeth Huddleson said she was delighted to have Joshua back.

She tweeted two pictures of the teen.

Ms Huddleson said: "Monday's can't get much better than this. Welcome back Josh! It is great to have you back."

Joshua and his family have become subject to an incredible outpouring of support on social media since Christmas which has led to thousands of strangers around the globe praying for the teenager.

Last week, his church launched a blood drive in honour of Joshua.

Bangor Elim Church need to recruit 100 people to give blood before they can get the ball rolling on their day of blood donation in the Co Down church hall.

Joshua's mum Kim has previously spoken out about the importance of giving blood, saying: “If you want to do something practical, then maybe you would consider giving blood.

“We’ve lost count of the number of transfusions Joshua has received and we are so thankful for those who donate blood. It costs nothing and literally saves lives. But sometimes stocks are low and Joshua has to wait until someone has donated.”